And as for REG . I suggest you read and understand these and when you understand all of that then there is a Lot More here at tvfool.
http://forum.tvfool.com/showthread.php?t=695 ,
http://forum.tvfool.com/showthread.php?t=233 ,
http://www.kyes.com/antenna/pointing/pointing.html .
http://forum.tvfool.com/showthread.php?t=491 ,
http://forum.tvfool.com/showthread.php?t=231 And as for making the size of the loop larger , the larger the loop the lower the operating frequency. There are many web sites for calculating tv antenna wave length. And many web sites for Tv antenna builders. I am well aware of the Highly Toot ted so called HDTV antennas. I am also well aware that 99% home built antennas are copies of factory built antennas designs , these antenna designs have been around for a Very Long Time. I am 61 years old and I have been doing Tv antennas for a very long time. I suggest that read the history of antenna manufactures and how they got there start in the early days of television , how one person was home building antenna designs of the own making , no one to copy from , how they learned more and more and started a company to make antennas , you might read the history of Winegard and Channelmaster and Jerrold and JFD and TACO and Blonder Tongue and more about the early days of television when the pioners made from scratch what you are copying now. And when you learn all that and more then you will cry like I do when you come to the realization of what they really did for all of us.